Malicious PDF — malware analysis report

Static analysis result for SHA-256 5274f467dc47bc00…

MALICIOUS

PDF

50.8 KB Created: 2020-07-29 10:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17293a8bb828d77433b9f96ee2d66f50 SHA-1: 36f3e2e2581442e005b9523a5ab501a8bdec4a18 SHA-256: 5274f467dc47bc00791098a1476e803ae5be975cba30393d9ed54813348c2936
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to the 'Narasimham committee report' and wkhtmltopdf, suggesting a lure. The primary malicious IOC is the ttraff.ru redirector URL, which is likely used to funnel victims to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=narasimham+committee+report+on+the+financial+system+1991+pdf
    • http://files.picturesquechange.org/uploads/1/3/2/8/132815054/614797a24b595fe.pdf
    • http://files.sweetonketobakery.com/uploads/1/3/0/8/130874369/7849f6d78.pdf
    • http://files.yuriokahana.com/uploads/1/3/1/4/131407802/121bb9c4f.pdf
    • http://files.artbytiffany.org/uploads/1/3/1/4/131406434/wabuwone.pdf
    • http://files.cellgenetherapy.com/uploads/1/3/0/8/130814666/5046855.pdf
    • http://files.yuriokahana.com/up
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/fumazav.pdf
    • https://cdn.shopify.com/s/files/1/0435/0771/2155/files/zofupimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9076/files/38871542406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3422/1466/files/zalesapun.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/kodipovukog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/89987517249.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/duvewewop.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/54830513768.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0432/0860/5859/files/75480013369.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/siked.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/gamezafuva.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/57426121224.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086fd.bin
e844fff151febe6d7879681ae1e6deecb45eef88d1e8bbdbc8dc802b9993fd17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FD 5460 bytes
font_01_sfnt_off00009972.bin
debda99917a13f025dc67e2a9a70d34750d2ac59d7681800061ec8a74a515ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9972 10604 bytes

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